The NSIS Eror m a y occur if the distributive file name is too long (more than 8 symbols) or if it will start from a folder the name of which is too long. In my case, I have renamed the original file of Avant Ultimate Version and placed the distributive file into C:/ directory. Only then the installation could start. So, one problem has been resolved.

However, I would like to let the older Orca version start as ever. Because IMHO it suits me completely. I cannot find the skin I like most of all in the latest Avant version (Office Adaptive).

Although the notion of beauty is a metaphysical one, and none can define it precisely, I do find that the fine nuances differentiating the interfaces of the older Orca and the latest Avant let me say that the former one is a bit more favourable in my opinion. And all the skins available in the latest Avant have been lacking the last touch if compared to the older Orca's Office Adaptive which is in fact lacking, imho.

However, I would prefer to talk shop.

My PC has errorneously written a false value of a variable somewhere so that Orca will not start. My task now is to find out how and why it did take place. I will not attribute all that to Orca's malfunctioning, not at all.

My PC is an old one for office jobs. So, I do not need a browser with multitask processing as if I had a processor with 4 kernels. If I am not mistaken, a (free) internet browser is a mass user software. Hence, it has to work with all kinds of hardware including older PCs, but not only the latest ones which may require the latest (mainly commercial) software. I do not think that the share of the latest PCs within the real world woulld be some 50% or around that value at present.

So, we have still to stick to older versions of software. Because the latest versions are too heavy for the most hardware.